1 /*-
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * Copyright (c) 1988 by Sun Microsystems, Inc.
31
32 */
33
34 /*
35 * rtime - get time from remote machine
36 *
37 * gets time, obtaining value from host
38 * on the udp/time socket. Since timeserver returns
39 * with time of day in seconds since Jan 1, 1900, must
40 * subtract seconds before Jan 1, 1970 to get
41 * what unix uses.
42 */
43 #include "namespace.h"
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 #include <errno.h>
48 #include <sys/types.h>
49 #include <sys/socket.h>
50 #include <sys/time.h>
51 #include <netinet/in.h>
52 #include <stdio.h>
53 #include <netdb.h>
54 #include "un-namespace.h"
55
56 #if defined(LIBC_SCCS) && !defined(lint)
57 static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";
58 #endif
59 #include <sys/cdefs.h>
60 __FBSDID("$FreeBSD$");
61
62 extern int _rpc_dtablesize( void );
63
64 #define NYEARS (unsigned long)(1970 - 1900)
65 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
66
67 static void do_close( int );
68
69 int
rtime(struct sockaddr_in * addrp,struct timeval * timep,struct timeval * timeout)70 rtime(struct sockaddr_in *addrp, struct timeval *timep,
71 struct timeval *timeout)
72 {
73 int s;
74 fd_set readfds;
75 int res;
76 unsigned long thetime;
77 struct sockaddr_in from;
78 socklen_t fromlen;
79 int type;
80 struct servent *serv;
81
82 if (timeout == NULL) {
83 type = SOCK_STREAM;
84 } else {
85 type = SOCK_DGRAM;
86 }
87 s = _socket(AF_INET, type, 0);
88 if (s < 0) {
89 return(-1);
90 }
91 addrp->sin_family = AF_INET;
92
93 /* TCP and UDP port are the same in this case */
94 if ((serv = getservbyname("time", "tcp")) == NULL) {
95 return(-1);
96 }
97
98 addrp->sin_port = serv->s_port;
99
100 if (type == SOCK_DGRAM) {
101 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0,
102 (struct sockaddr *)addrp, sizeof(*addrp));
103 if (res < 0) {
104 do_close(s);
105 return(-1);
106 }
107 do {
108 FD_ZERO(&readfds);
109 FD_SET(s, &readfds);
110 res = _select(_rpc_dtablesize(), &readfds,
111 (fd_set *)NULL, (fd_set *)NULL, timeout);
112 } while (res < 0 && errno == EINTR);
113 if (res <= 0) {
114 if (res == 0) {
115 errno = ETIMEDOUT;
116 }
117 do_close(s);
118 return(-1);
119 }
120 fromlen = sizeof(from);
121 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
122 (struct sockaddr *)&from, &fromlen);
123 do_close(s);
124 if (res < 0) {
125 return(-1);
126 }
127 } else {
128 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
129 do_close(s);
130 return(-1);
131 }
132 res = _read(s, (char *)&thetime, sizeof(thetime));
133 do_close(s);
134 if (res < 0) {
135 return(-1);
136 }
137 }
138 if (res != sizeof(thetime)) {
139 errno = EIO;
140 return(-1);
141 }
142 thetime = ntohl(thetime);
143 timep->tv_sec = thetime - TOFFSET;
144 timep->tv_usec = 0;
145 return(0);
146 }
147
148 static void
do_close(int s)149 do_close(int s)
150 {
151 int save;
152
153 save = errno;
154 (void)_close(s);
155 errno = save;
156 }
157